tentukan hasil perkalian dari: a.5x²(6x-3y) b.(2x-2)(x+5) c.(x-5)(x²-4x+20)

[tex]5x^2(6x-3y)=30x^3-15x^2y \\ \\ =============== \\ \\ (2x-2)(x+5)=2x^2+10x-2x-10 \\ \\ (2x-2)(x+5)=2x^2+8x-10 \\ \\ =============== \\ \\ (x-5)(x^2-4x+20)=x^3-4x^2+20x-5x^2+20x-100 \\ \\ (x-5)(x^2-4x+20)=x^3-9x^2+40x-100[/tex]